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This lesson talks about the maintenance of abnormal charging of Android mobile phones,

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mainly from four aspects

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The first is no charging icon maintenance

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Second, abnormal battery maintenance

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Third, abnormal temperature maintenance

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Fourth, low battery maintenance

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First look at how to repair no charging icon

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Let's take a look at the normal mobile phone charging phenomenon

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Normally, there will be a prompt when the mobile phone is charging.

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For example, the current mobile phone prompts a circle

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Some hints are that there will be a lightning icon in the upper right corner or the phone will vibrate

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These are normal mobile phone charging phenomena

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That abnormal cell phone is the opposite

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After plugging in and charging, there is no prompt on the phone interface,

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no vibration, and no charging icon is displayed

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It is in the upper right corner where the charging icon is generally not displayed

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There is no difference between a mobile phone and a charging cable

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This is the failure without charging icon

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Next, look at the charging process

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The charging process is that when we plug in the charger,

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the data cable will have a 5V power supply to the small board at the end of the phone

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This power is supplied to the overvoltage protection circuit on the motherboard

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The overvoltage protection circuit recognizes that the power supply is normal and lets it pass

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After passing, it provides power to the charging chip on the motherboard

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After the charging chip adjusts the 5V voltage, it will output power to the battery to charge the battery

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The CPU detects the charging power information through the bus and controls the work of the charging chip

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Which circuits are related to the unresponsiveness of plugging in the charger?

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It is related to the channel of the 5V power supply, there are data lines, chargers,

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and the lines on the small board of the tail plug or the tail plug cable

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If the tail plug cable is damaged,

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it will also cause the 5V power supply to fail to supply the overvoltage protection chip

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In the same way, if the overvoltage protection circuit on the main board fails,

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the 5V power supply cannot be supplied to the charging chip internally

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If there is no abnormality in the overvoltage protection circuit and there is an abnormality in the charging chip,

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it will not be able to step down the 5V power supply to the battery

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If there is no problem with the charging chip, the CPU loses control of the charging chip,

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causing the charging chip to not work, which will also cause a failure of no charging

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The related circuits that lead to non-charging are the data line, the charger,

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the tail plug cable, the overvoltage protection circuit on the motherboard, the circuit of the charging chip,

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and the circuit controlled by the CPU through the bus

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Only these 6 items need to be considered if there is no response to plugging and charging

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That's all for this lesson